不明白以下定义数组的代码 car [ ] carForRent={new passengerCar(1,"奥迪A4",500,4),new passengerCar
car [ ] carForRent={new passengerCar(1,"奥迪A4",500,4),new passengerCar(2,"马自达6",400,4),
new pickUp(3,"皮卡雪6",450,4,2),new passengerCar(4," 金龙 ",800,20),
new trunk(5,"松花江",400,4),new trunk(6,"依维柯",1000,20)};